Method of making paper boxes.



PATENTED JUNE 27, 1905.

Ila 793,041.

J. BERGOFF.

METHOD 'OF MAKING PAPER BOXES.

APPLICATION FILED AUG. 24, 1904.

Patented June 2'7, 1905.

UNITED STATES PATENT OFFICE.

JULIUS BERGOFF, OF BUFFALO. NEW YORK, ASSlG-NOR TO EMPIRE JEV- ELRY CASE COMPANY, OF BUFFALO, NEW YORK, A CORPORATION OF NEW YORK.

METHOD OF MAKING PAPER BOXES.

SPECIFICATION forming part of Letters Patent No. 793,041, dated June 27, 1905.

Application filed August 24, 1904. Serial No. 221,912.

To all [Uh/077D it nmy cancer/L.-

Be It known that I, JULIUs BERGOFF, a citizen of the United States, residing at Buffalo,

in the county of Erie and State of New York, have invented new and useful Improvements in Methods of Making Paper Boxes, of which the following is a specification.

This invention relates to the manufacture of boxes, and more particularly to round-cornered jewelry boxes or cases. Hereto'fo're such jewelry-cases have been made of wood by constructing a square-cornered box, gluing fil1ing-blocks in its corners, and then rounding the corners by cutting or trimming off the surplus stock. Aside from the cost of the wood this method of manufacture renders such cases comparatively expensive.

The object of my invention is to devise a simple method by which a strong box or case of this kind can be cheaply constructed of paper or pasteboard.

In the accompanying drawings, Figure I is a perspective view of the laminated band forming the sides of the box produced by my improved method. Fig. 2 is a perspective view of the box, showing the bottom board glued thereto and the top board separated therefrom. Fig. 3 is a longitudinal central section of the box and the expansible former placed therein. Fig. I is a top plan view of the box and the former.

Similar letters of reference indicate corresponding parts in the several figures.

Boxes or cases of the kind above referred to are usually oblong and have rounded corners, and the cover is generally deeper than the body of the box. In producing such a box according to my improved method an approximately circular band A, of paper or pasteboard, is first formed, preferably by gluing two or more strips of pasteboard a one upon another, so as to form a laminated band having about the thickness of the walls of ordinary wooden jewelry-cases. This endless band forms the walls or sides of the box. As shown in the drawings, the strips of the band are laid upon one anotherso as to break joints. The glue which unites the strips moistens and softens the same, andzwhile the glue is still soft the band is stretched into oblong or rectangular form preferably with straight sides and ends and rounded corners by means of an expansible former placed within the band and having the proper contour and dimensions to form a box of the desired size and shape, as shown in Figs. 3 and 4. The preferred former shown in the drawings consists of a pair of similar rectangular blocks B B, having straight sides and ends and rounded corners b and toggle-bars O O, connected by a hinge c and adapted to hear at their outer ends against opposing transverse shoulders d of the blocks, so that upon straightening the toggle-bars, as shown by full lines in Fig. 3, the blocks are farther separated, thereby stretching the band A and causing it to conform closely to the contour of the blocks. The thickness of the blocks is preferably somewhat less than the width of the band A, and in order to center the blocks in the band a space-plate e of the proper thickness is temporarily placed in the band between the bottom of the blocks and the work bench or table, so as to raise the blocks above the lower edge of the baiid, as shown in Fig. 3. While the band A is in its stretched condition a bottom F, preferably of paper-board, is glued to one edge thereof, as shown in Figs. 2 and 3, and when the glue has become dry or set the former B is collapsed and removed from the band by deflecting the toggle-bars O, as shown by dotted lines in Fig. 3. A top G, preferably of paper-board, is next glued to the opposite edge of the band A, and the two boards are then trimmed flush with the band, and the edges of the case may be beveled or rounded, as in wooden jewelrycases. The closed case so formed is next divided lengthwise by sawing or cutting the board upon the dotted lines shown in Fig. 2-, thus forming the body and the cover of the jewelry-case, and finally the two box members are suitably covered, ninged together, and finished in the ordinary manner. The stretching of the band causes its layers to be tightly drawn against one another, thereby condensing the fibers thereof and rendering the sides of the box much stronger and firmer than those of a box formed by Winding a strip of paper around a solid or non-expansible form, according to one of the methods hitherto practiced. As one of the boards F G is secured to the band before the former-blocks B are removed therefrom, the band is reliably retained in its stretched form by the board.

My improved box or case can be produced at much less cost than the Wooden jewelrycases heretofore employed, and it possesses greater strength at the corners than such a case, as it is free from corner-joints.

For economy of manufacture both the body and the cover of the case are preferably constructed at the same time by using a band A of the proper Width and dividing the same after applying the top and bottom boards F G thereto, as hereinbefore described; but it is obvious that the body and the cover could be made separately according to my improved method by employing a separate endless band for each of the boxmembers and then gluing a board to one edge thereof to form either the top of the cover or the bottom of the body.

While this improved method is especially desirable for making round-cornered boxes or cases, it is also applicable to the manufacture of boxes of other forms, the formerblocks B being properly shaped to produce a box of the desired form. v

I claim as my invention 1 The herein-described method of making paper-box bodies or covers, which consists in forming an endless paper band of the proper Width, thickness and diameter, then stretching the band While in a soft and moist condition to the desired shape and dimensions, and finally securing a board to one edge of the band While in its stretched condition, sub stantially as set forth.

2. The herein-described method of making aper-box bodies or covers, which consists in orming a laminated endless band by gluing together a number of pasteboard strips, then stretching the band to the desired shape and dimensions by a suitable former placed therein While the glue is still soft, whereby the layers of the band are tightly drawn against each other in the act of properly shaping the band, and finally securing a board to one edge of the band While in its stretched con dition, substantially as set forth.

Witness my hand this 18th day of August, 1904.

JULIUS BERGOFF.

Witnesses:

ED\VARD l/VARNER, O. F. GEYER. 

